Yamaha Motors
https://www.crowleymarine.com/yamaha/products/6e5-11370-00-00-check-valve-assy
.CHECK VALVE ASSY 6E5-11370-00-00
https://www.crowleymarine.com/yamaha/products/6e5-11370-00-00-check-valve-assy
Price not available
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Product Description
Yamaha factory part.